Earthquake · reviewed by a seismologist
M 2.8ml
Earthquake near Florence, OR
No earthquake was likely felt in Florence in the 24 hours to 8:00 pm PST (04:00 UTC). The last one was M 5.5, 259 km (161 mi) WSW, at 4:35 am PDT on 29 June 2026, estimated intensity II (weak) in town; 22 felt reports to USGS. Every earthquake near Florence
This page: a magnitude 2.8 earthquake was recorded 32 km (20 mi) north-northeast of Florence, OR, at 3:21 pm PDT on 26 September 2017 (22:21 UTC), 24 km deep. 3 people have reported feeling it to USGS.
USGS: 13 km ESE of Yachats, Oregon
70 km (43 mi) WNW of Eugene, OR
- When
- 3:21 pm PDT on 26 September 2017 ()
- Where
- 32 km (20 mi) north-northeast of Florence, OR · earthquakes near Florence
- Magnitude
- M 2.8 (ml)
- Depth
- 24 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Lincoln County, 43 km N
- Nearest mapped fault
- Cascadia fold and fault belt, 15 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1558 days ago
Earthquake alerts for Florence, OR
Get a notification in this browser when USGS records an earthquake near Florence, OR. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 11 km (7 mi) from the epicentre. In Florence, 32 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Waldport.
How big was it?
This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
- Magna, Utah 2020 M 5.7 25,000× the energy of this one
- Around the size people start to feel M 3.0 2.2× the energy of this one
- This earthquake M 2.8 about 430 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 44.2518, -123.9532. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lincoln County, OR | 43 km (27 mi) | N | earthquakes near Lincoln County |
| Benton County, OR | 50 km (31 mi) | ENE | earthquakes near Benton County |
| Polk County, OR | 84 km (52 mi) | NNE | earthquakes near Polk County |
| Lane County, OR | 92 km (57 mi) | ESE | earthquakes near Lane County |
| Linn County, OR | 116 km (72 mi) | ENE | earthquakes near Linn County |
| Coos County, OR | 119 km (74 mi) | S | earthquakes near Coos County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
35 earthquakes have been recorded within 50 km since this one.
- 1.7 29 km WNW of Yachats, Oregon
- 1.7 10 km S of Alsea, Oregon
- 1.9 3 km NW of Yachats, Oregon
- 1.9 23 km WNW of Yachats, Oregon
- 1.9 16 km SSE of Toledo, Oregon
- 2.7 27 km WNW of Yachats, Oregon
- 1.7 28 km ESE of Florence, Oregon
- 1.6 18 km WNW of Yachats, Oregon
- 2.3 29 km W of Waldport, Oregon
- 1.8 27 km WNW of Yachats, Oregon
- 1.9 12 km E of Toledo, Oregon
- 1.5 28 km WNW of Yachats, Oregon
- 1.9 30 km W of Yachats, Oregon
- 1.8 31 km W of Yachats, Oregon
- 1.8 31 km W of Yachats, Oregon
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.